Earth-boring tool.



T. E. NOBLE. EARTH BORING TOOL. v APPLlC,ATlON mm m. 21. 1919 1,271,750 Patented July 9,1918.

fIiIaMafi gm Qumran THOMAS E. NOBLE, OF YALE, OKLAHOMA.

EARTH-'IBOBILN'G TOOL.

Specification of Letters Patent.

Patented July 9, 1918.

Application filed. February 21, 1918. Serial No. 218,546.

T 0 all whom it may concern.-

Be it known that I, THOMAS E. NOBLE, a citizen of the United States, residing at Yale, in the county of Payne and State of Oklahoma, have invented certain new and useful Improvements in Earth Boring Tools, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to certain improvements in earth boring tools and has relation more particularly to a bit for drilling deep wells and it is an object of the invention to provide a novel andimproved device of this general character which is adapted to drill below the casing of -a deep well thereby permitting the well to be drilled with. but a single string of easing so that the possibility of cave-ins and loss of tools is substantially eliminated.

The invention also has for an object to provide a tool of this general character having novel and improved means whereby the tool serves as an expansible reamer to assure the desired drilling below the casing.

The invention consists in the details of construction and in the combination and arrangement of the several parts of my improved earth boring tool whereby certain important advantages are attained and-the device rendered simpler, less expensive and otherwise more convenient and advantageous for use, as will be hereinafter more full set forth.

The novel features of my invention will hereinafter be definitely claimed.

In order that my invention may be the better understood I will now proceed to describe the same with reference to the accompanying drawings, wherein:

Figure 1 is anelevational view of a boring tool constructed in accordance with an embodiment of my invention;

Fig. 2 is a view similar to Fig. 1, showing certain of the parts in a second position;

Fig. 3 is a view partly in elevation and partly in section illustrating the members as arranged in Fig. 2;

Fig. 4 is a fragmentary view in elevation with certain of the parts omitted; and

Fig, 5 is a sectional view taken substantially on the line 7-7 of Fig. 4.

As disclosed in the accompanying drawings, the working end of the bit 1 is pro vided at its opposed faces with the longitudinally disposed grooves or recesses 8 having their outer ends open and flared as indicated at 9. Disposed longitudinally of the grooves 8 substantially midway thereof is the slot 10 of desired length and the portion of the bit in advance of the groove 8 is split as indicated at 19 with the faces of said split correspondingly beveled and in overlying relation. By this arrangement it will be perceived that the working end portion of the bit may be readily expanded to properly drill below a casing. I

Seated within the grooves 8 are the arms 11 having their lower ends provided with the cam 12 which coacts with the flared portions 9 of the grooves for expanding the working end portion of the bit 1 The in ner faces of the arms 11 are provided with the inwardly directed blocks 14, extending within the slot 10 and having their opposed faces in contact. Directed through said arms 11 and blocks 14 is the holding pin 15 whereby the arms 11 are maintained in applied position and have limited movement longitudinally of the bit 1 The inner end portion of each of the grooves 8 isprovided with a substantially abrupt'incline to alford a cam 16 and immediately adjacent the high point of said cam is a recess 17 adapted to receive an inwardly directed lug or lip 18 carried by the inner portion of the adjacent arm 11. As the bit l is dropped the contact of the lower endsv of the arms 11 with the work will result in expansion of the working end of the bit and also in a sufficient separation of the inner end of the arms 11 as to cause the lugs or lips 18 thereof to seat within the recesses 17. The expansion of the inner ends of the arms 11 is also such as to cause said inner ends of the arms to contact with the lower edge of the casing upon upward movement of the bit 1 so that the arms 11 are forced outwardy of the bit 1 to permit contraction of the working end of the bit and the desired upward movement of the bit 1 within the casing This embodiment of my invention is particularly adapted for use with hard stone or tough formation.

From the foregoing description, it is thought to be obvious that an earth boring tool constructed in accordance with my invention is particularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated and it will also be obvious that my in vention is susceptible of some change and modification without departing from the principles and spirit thereof and for this reason I do not wish to be understood as limiting myself to the precise arrangement and formation of the several parts herein shown in carrying out my invention in practice except as hereinafter claimed.

I claim:

1. A tool of the class described comprising a bit having its working end. portion split, a face of said bit being provided with a groove, the open end portion of the groove being flared, and an arm mounted for movement longitudinally within the roove and provided with a cam coacting wit the flared end portion of the groove for expanding the split portion of the bit.

A o o he c s des ribed comprising a bit having its working end portion split, a face of said bit being provided with a'groove, the open end portion of the groove being flared, an arm mounted for movement longitudinally within the groove and provided with a cam coacting with the flared end portion of the groove for expanding the split portion of the bit, and coacting means carried by the arm and bit for locking the arm at, the limit of its movement in one clirection.

3. A tool of the class described comprising a bit having its working end portion split, a member mounted for movement longitudinally of the bit and expanding the split portion of the bit upon movement of the member in one direction, and coacting means carried by the member and bit for locking the member at the limit of its movement in said direction.

4. A tool of the class described comprising a bit having its'working end portion split, a face of said bit being provided with a groove, a portion of the groove being flared, and an arm mounted for movement longitu- Copies of thisv patent may be obtained for five cents each, by

Washington-,'1).0..

dinally within the groove and provided with a cam coacting with the flared portion of the groove for expanding the split portion of the bit.

5. A tool of the class described comprising a bit having its working end portion split, a face of said bit being provided with a groove, an arm mounted for movement longitudinally within the groove and expanding the split portion of the bit upon movement of the arm in one direction, the inner end portion of the groove being inclined, the face of the bit at a point adjacent the high point of the incline being provided with a recess, the inner end portion of the arm being provided with a lip adapted to seat within the recess when the arm is at the limit of its inward movement.

6. A tool of the class described comprising a bit having its working end portion split, the outer faces of the bitbeing provided with grooves,'said grooves being provided with registering slots, an arm mounted for movement longitudinally within each groove and expanding the split portion of the bit upon movement of the arms in one direction, said arms being provided with inwardly directed blocks extending within the slots, and means for connecting the portions of the arms provided with the blocks. I

7 A tool of the class described comprising a bit having its working end portion split, said split portions being provided with a slot arranged longitudinally thereof,arms coacting with the oppositefaces of the bit and expanding the split portion thereof upon movement of the arms in one direction, said arms being provided with inwardly directed blocks extending within the slot, and means for connecting the portions of the arms provided with the blocks.

In testimony whereof I hereunto aihx my signature in the presence of two witnesses.

' THOMAS E. NOBLE.

Witnesses:

" G. F. PA MELE W. J. BERRY.

addressing the Commissioner of-Patents, 

